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United States Patent | 5,141,769 |
Platz | August 25, 1992 |
Surfaces of structural components of metal or the like are protected by depositing a wear-resistant dispersion coating of a matrix metal and hard-material particles embedded in the metal matrix. The depositing is accomplished by a sequential plasma spraying and particle blasting, whereby the hard-material particles are applied separately from the plasma stream to inject the particles into the plastically still deformable matrix metal. The coating steps are performed in an evacuated chamber or in an inert gas environment. These coatings are especially suitable on the blade tips of gas turbine engines, on the sealing fins of labyrinth seals or as "rub" coatings on circumferential rotor surfaces or the like.
Inventors: | Platz; Albin (Ried-Baindlkirch, DE) |
Assignee: | MTU Motoren-Und Turbinen-Union GmbH (Munich, DE) |
Appl. No.: | 628215 |
Filed: | December 17, 1990 |
Dec 19, 1989[DE] | 3941853 |
Current U.S. Class: | 427/446; 427/196; 427/203; 427/205; 427/425; 427/426; 427/453; 427/455 |
Intern'l Class: | B05D 001/08; B05D 001/02; B05D 001/36; B05D 001/34 |
Field of Search: | 427/34,196,202,203,204,205,425,421,422,423,424,426 |
3020182 | Feb., 1962 | Daniels | 427/423. |
3340084 | Sep., 1967 | Eisenlohr | 427/423. |
3844729 | Oct., 1974 | Sedlatschek et al. | 427/225. |
4160048 | Jul., 1979 | Jaeger | 427/425. |
4224356 | Sep., 1980 | Singer | 427/423. |
4241110 | Dec., 1980 | Ueda et al. | 427/203. |
4358471 | Nov., 1982 | Derkacs et al. | 427/34. |
4386112 | May., 1983 | Eaton et al. | 427/423. |
4596718 | Jun., 1986 | Gruner | 427/425. |
4740395 | Apr., 1988 | Tsunekawa et al. | 427/423. |
5022455 | Jun., 1991 | Takeda et al. | 427/196. |
Foreign Patent Documents | |||
2823817 | Dec., 1978 | DE | 427/142. |